when i finish my project after that i want to export my app but qr code is not getting generated and apk is not getting saved in computer
Do you get an error message, if so what kind…
Just wait for some time, try after 1-2 hours or re-set your internet connection, it happens sometimes.
When you select “Generate QR code for app”, it should show a dialog (I am on Chrome OS guest so can’t take a screenshot) containing your QR code and URL (both are redirect you to same link). Did it appear?
Maybe your browser can not load the QR (or dialog) because of you used 100 percent of mobile data. Also it doesn’t save .apk to computer without opening that link at dialog.
EDIT: I CAN take screenshots.